The papers in this volume were presented at the two-sessionSymposium on Vibration Effects of Earthquakes on Soils andFoundations held on 25 June 1968 during the 71st Annual Meeting ofthe Society at San Francisco, Calif. The Symposium was sponsored bySubcommittee 9 on Dynamic Properties of Soils, of Committee D18.Chairman of the Symposium was E. T. Selig, associate professor ofengineering and applied sciences, State University of New York atBuffalo. Co-chairman was Delon Hampton, professor of civilengineering, Howard University.